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    Thread: OHC vTec ECU swap

    1. #1

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      OHC vTec ECU swap

      Hello everyone. This is my 1st thread on gearhead .
      I think probably some of OHC owners, the model before 2002. Have experienced jerk while driving the car on 1st & 2nd gear, especially at lower rpm. I've read that the problem is due to faulty ECU and it requires to be swapped by a standalone ECU.
      -Hence, I'm planning to get the ECU revamp. Please give me an approximate on how much it would cost?
      -Anything else that needs to be repaired to stop the jerk? Fuel pump , fuel filter .. Please give your suggestions





      --Drive safe-

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      Your best guide for anything related to OHC's would be our in-house Honda Doc 007 please contact him and he would have all the answers.

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      Pavan, who told you it's a ECU fault?
      2002 Tata Indica DLS.
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      2005 Suzuki Baleno - India's fastest Naturally Aspirated Baleno timed on a drag strip officially!
      2008 Suzuki Swift VDi - The Rattle King.
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      2016 Ford Ecosport 1.5 TDCi Titanium - The SQ Machine in the making.
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      Thanks Pr_007. I shall contact him.


      Quote Originally Posted by mclaren1885 View Post
      Pavan, who told you it's a ECU fault?
      Well, I read reviews by couple of OHC owners, they have they same problem. I believe post ECU swap, the problem was rectified.
      Anyways, I'm planning to have it tested by RedRooster performance. I would like to know there could be something else that's causing it?




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    5. #5
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      Pavan_MP423, that jerk you mention is a chronic problem with the older VTECs and the small price you pay for great mid range and top end performance. the ECU is just a part of the solution. I doubt that just changing the ECU will solve it. from what I gather, they changed the following in the revised OHC VTECs to solve that problem:

      1. smaller valves in the head
      2. heavier crank pulley
      3. ECU mapping to go with the above two items

      again, I dont know this for sure but Ive heard it from a source I highly trust.

      I would say just forget about the issue and stay in a gear lower when you accelerate from low speeds. however, if you feel that it is a real pain, you could swap your ECU and see what happens.

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      Precisely my point. Getting rid of the jerking issues by swapping to an aftermarket ECU is not something I'd advice as well.

      I would suggest you live with it. Also are you sure the jerks aren't due to a bad fuel filter + clogged injectors + diesel filter + fuel pump?

      The jerking problem happens in the Baleno too, but if all the above are in good shape, it reduces the jerks quite a bit.

      Either ways, changing your ECU should be your last option.
      2002 Tata Indica DLS.
      2004 Suzuki Zen - A G13B eater.
      2005 Suzuki Baleno - India's fastest Naturally Aspirated Baleno timed on a drag strip officially!
      2008 Suzuki Swift VDi - The Rattle King.
      2011 Chevrolet Cruze - The Torque Monster.
      2016 Ford Ecosport 1.5 TDCi Titanium - The SQ Machine in the making.
      2017 Skoda Octavia VRS - A 400+HP corner craving machine!
      2013 BMW X1 - The RWD Sideways Machine
      2019 Polo GT TSI - The Commute Workhorse.
      2014 MOC SQ Pro Champions.
      Harmonixx Tuning - Importers for Audiofrog & Arc Audio/APR Tuning Authorized Dealers/Engine Remap Specialists for all makes/models.
      Dealers for Rainbow/Mosconi/Eton/Stetcom/Tru Technology/Blam Audio/Mobridge/Stetsom/Audible Physics/AIV/Gladen/Dampmat/Dr Artex Damping and more.

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      Quote Originally Posted by mclaren1885 View Post
      Also are you sure the jerks aren't due to a bad fuel filter + clogged injectors + diesel filter + fuel pump?


      the jerkiness is a known problem with those models Rahul. the first batch of engines were tuned according to the Japanese spec I believe. the first 1000 engines were assembled, pre run in, tuned and then imported from Japan if I also have my facts right. because they were not specfiically designed for our conditions and driving styles, this issue exists.

      stock vs stock, those first 1000 engines perform in a totally different league when compared to the revised engines.

      Pavan_MP423, can you check your registration certificate and let us know what the engine number reads?
      Last edited by 007; 4th Mar 2012 at 13:41.

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      Yes Venkat I got the point. But the jerks get more pronounce if the parts I mentioned also aren't in good condition. So I'd ideally try to eliminate these issues to ensure they aren't adding to the jerks caused by the mapping.

      Besides, what aftermarket ECU? That thought itself scares me!
      2002 Tata Indica DLS.
      2004 Suzuki Zen - A G13B eater.
      2005 Suzuki Baleno - India's fastest Naturally Aspirated Baleno timed on a drag strip officially!
      2008 Suzuki Swift VDi - The Rattle King.
      2011 Chevrolet Cruze - The Torque Monster.
      2016 Ford Ecosport 1.5 TDCi Titanium - The SQ Machine in the making.
      2017 Skoda Octavia VRS - A 400+HP corner craving machine!
      2013 BMW X1 - The RWD Sideways Machine
      2019 Polo GT TSI - The Commute Workhorse.
      2014 MOC SQ Pro Champions.
      Harmonixx Tuning - Importers for Audiofrog & Arc Audio/APR Tuning Authorized Dealers/Engine Remap Specialists for all makes/models.
      Dealers for Rainbow/Mosconi/Eton/Stetcom/Tru Technology/Blam Audio/Mobridge/Stetsom/Audible Physics/AIV/Gladen/Dampmat/Dr Artex Damping and more.

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      Quote Originally Posted by mclaren1885 View Post
      Besides, what aftermarket ECU? That thought itself scares me!
      he could either get a stock ECU from a later model VTEC or he could run a Moates / Hondata chipped ECU with a patch harness. both perfectly reliable.

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      Quote Originally Posted by 007 View Post

      I would say just forget about the issue and stay in a gear lower when you accelerate from low speeds. however, if you feel that it is a real pain, you could swap your ECU and see what happens.

      Driving the car , being aware of the jerk problem is very annoying . I shall checkout the reg. certificate & let you know the engine no.

      mclaren1885, I'll get the same checked ones before deciding on to swap the ECU.

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